Fig. 1

An image taken from the Galileo spacecraft during its first orbit of Jupiter shows at resolution 1.6 km/pixel a region that is unusually rich in small dark spots, called lenticulae. The spots in this region are typically ~10 km wide. Later, more complete imaging showed that lenticulae are part of a continuum of sizes of dark splotches with wide spatial distributions. These dark splotches of all sizes (including the large one at the left edge here) are found generally to consist of chaotic terrain. The dark lineaments are associated with a variety of tectonic features; the two darkest lineaments intersecting at he upper right are Udaeus and Minos Linea. Scale bar ca. 200 km (NASA/JPL)